Stovepipe.



E. W. EDWARDS.

STOVEPIPE.

APPLICATION FILED sunazs. 1915.

' 1,15%,W4. 'PzitentedSept. 14, 1.915.

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To all whom it may concern Be it known that l, EDWARD W.. EDWARDS,

' a citizen of the United States'of Aanerica,

and a resident of Cincinnati, county of Hamilton, State of Ohio, have invented certain new and useful Improvements in Stovepipes,

of which the following is a full and clear specification, reference companying drawings, in which igure 1 is a perspective view of a section of the stove pipe with its edges connected ready for use; Fig. 2 a fragmentary perspective View, enlarged, connected; Fig. 3 a similar View showing the parts approximately as they appear during the act of connecting up the joint; and Fig. 4 a View similar to Fig. 2 showing a slightly different form of tongue.

= sheet, the space between the front wall of the channel c', so that said. channel 0 lies under said edgeportion 'a' cnnder the opposite v The object of this invention is to provide the longitudinal meeting edges of the section with means whereby the seampt that point may be interlocked at the place of sale or use of the section, thereby permitting the sections to be transported and shipped with their longitudinal seams openthe full length of the sections, and be conveniently nested, as more fully hereinafter set forth.

On one of the longitudinalv section is formed a flange 6, ing bent into shape from an extension of the edge of the sheet and being arranged to extend'along the interior of the pipe. This flange is shaped so asto form two channels 0, c, the former lying under-and back of the edge a of the sheet and the latter lying. a short distance away fromthe edge of the edge of the sheet edges of the and the free edge 03 of the the channels.

with 'a tongue e extendingthe full l'eh of the sheet and ofi'set inwardly from the same sufficiently to be inserted in the channel 0,- 1 this offset of the tongue forming a longitudi nal shoulder f and serving to maintain "the circumferential alinement of the: parts a anda of the pipe section. When the parts are interlocked, the edge portion a of the pipe section rests against the front faceof the ust as does the channel I v edge a of the. sheet. ,gTo-holdthe tonguee in'the channel a na tlius interlock the edges vthat the freeedg'e terlock with the being had to' the acshowing the joint sheet,

so that'j'th'e sections may the full length of the this flange-be-- outer wall of the, channel a forming a throat or entrance to Specification of Letters Patent. Patented gp h 11%, 19115; Application filed June 28, 1915. Serial No. 36,797. i i

of the section together, the part forming the shoulder f is'inclined slightly backwardly so (Z of the channel 0' will inshoulder, said free edge bearing againstthe shoulder its'full length at the junction of the shoulder with the edge a of the sheet. The inner edge of the shoulder will bear against the flange b at a point opposite the throat, and the free edge of the tongue 0 will bear outwardly against the 'in ner Wall of the channel 0, thus forming a smoke and gas-tight joint extending the full length of the pipe section.

To connect and interlock the edges ofthe he tongue 0 is inserted into the throatofthe two channels and then the two edges of the sheet are pressed inwardly, as shown in Fig. 3, far enough to cause the shoulder f to spring past the free edge 01, whereupon sald free edge will engage behind the oblique shoulder and thus interlock ing a strong, smooth the parts, makand neat joint eXtending the full length of thepipe section. A

feature of special importance is that the backward bending of engagement with the free edge of the chan the shoulder f and its nel cv provides a solid abutment extending pipe section, this abut-- resist the expansive tendment"'se1'.v1I,1g to when highly heated. To

ency of the pipe render the joint still further proof against "leakage of'gas or smoke, the tongue 6 may be bent .or crlmped longitudinally, as shown at e in Fig. 4, so'that said bent part will bearagainstthe front wall of the channel 0 and the extreme-free edge of the tongue Wlll bear'against the inner wall of the channel 0,

thus providing three contacting points throughout the length of the joint.

these channels lying in the interior of the ed e of the sheet being formed into a-longi tudinal tongue, said tongue be ng formed with an inwardly and backwardlyextending shoulder adapted to enter one of, the

channels and. with a free enterthe opposite channel.

2. A sheet metal stove pipe section having formed along one edge of the sheet a .fiange plpeand'having a narrow entrance or throat. 'along the edge of' the sheet, andthe other ,95' Having thus described my invention, What edge adapted to bent to form two channels facing each 'other, I

these channels lyingin the interior of the pipe and having a narrow entrance or throat alon the edge of the sheet, and the other edge of the sheet being formed into a longitudinal tongue, said tongue being formed with an inwardly and backwardly extending shoulder adapted to enter one of the channels and with a free edge adapted to enter the opposite channel, said free edge of the tongue being bent or crimped longitudinally 1 throughout its length, for the purpose set forth.

In testimony whereof I hereunto afiix my signature.

EDl/VABD W. EDWARDS. 

